[Tile-serving] [osm2pgsql] Maybe we can use std::thread only? (#466)

[alex85k]

Since osm2pgsql is now fully C++11, maybe it is a time to switch from boost::thread and pthread fragments to std::thread from standard library (like libosmium)? @pnorman  @lonvia 

Its functionality should be enough (I have seen nothing complex). The advantages
  
   - Can get rid of boost::thread dependency (+boost_date_time and boost_chrono on some systems) and related bugs like https://github.com/openstreetmap/osm2pgsql/pull/460#issuecomment-149125399 on clang
   - Make multithreading work on Windows https://github.com/openstreetmap/osm2pgsql/issues/464 :) (pthread should be enough?)
   - there are only 3 files to adapt and 2 of them are just "create n threads -> join":
https://github.com/openstreetmap/osm2pgsql/blob/eece9ac7fd73bf0a922ff98c140953e957de6670/output-pgsql.cpp#L395
https://github.com/openstreetmap/osm2pgsql/blob/eece9ac7fd73bf0a922ff98c140953e957de6670/middle-pgsql.cpp#L1191
https://github.com/openstreetmap/osm2pgsql/blob/eece9ac7fd73bf0a922ff98c140953e957de6670/osmdata.cpp#L244


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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/osm2pgsql/issues/466
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